Steam version is the only one where the autosplit works. GOG does not work currently. Then which timer should be taken into account when you submit a run? I split manually, but every run the livesplit timer isn't synced with the in-game timer; basically, the in-game timer is behind the livesplit's one.

Edit : Okay found the answer in another post I guess, I'll keep using livesplit only to know if I'm ahead or not.